I had originally modified the `getBindings` version to use `ko.bindingValueIsAccessor`, but without that change, it breaks the test. That's because `getBindings` gets called twice: first to get the list of binding and convert to value-accessors, and second to access the binding value through the accessor. You can see that in the code [here](https://github.com/SteveSanderson/knockout/pull/933/files#L4R52).

So we could put back in the `getBindings` version, but we'd have to account for the extra call.